Lisrel
abbr. linear structural relations 线性结构关系
🗣️ 情景例句
When would you be available to start work here?
你什么时候可以开始来这边上班？
What's the height of the building?
这座楼有多高？
This is because they had no natural enemies until the arrival of humans and therefore did not need to develop flying wings.
这是因为人类到达这里之前，这些鸟没有天敌，因此，它们不需要发育飞行的翅膀。